Beker J, Feuerstein R. Toward a Common Denominator in Effective Group Care Programming: The Concept of the Modifying Enviornment. jcycw [Internet]. 1991 Mar. 1 [cited 2024 Nov. 24];7:20-3. Available from: https://acycpjournal.pitt.edu/ojs/jcycw/article/view/179